diff --git a/cave_data/1623-78.html b/cave_data/1623-78.html
index bec341447..bb3761c91 100644
--- a/cave_data/1623-78.html
+++ b/cave_data/1623-78.html
@@ -69,7 +69,7 @@ code used in the Austrian kataster e.g '1/S +' - https://expo/.survex.com/katast
 <depth>SMK system total 1032m</depth><!--Cave depth. Can be left blank and system should fill it in automatically from survey data (it doesn't yet)  -->
 <extent>SMK system total 2812m</extent>
 <survex_file>caves-1623/78/78fix.svx</survex_file><!-- Name of top-level survey file for this cave. Relative to the 'loser' survex repository. So for most caves that's "caves/cavenum/cavnum.svx". (e.g. caves/204/204.svx -->
-<description_file>1623-78.html</description_file><!-- Path of top-level description file for this cave, when a separate file is used. Otherwise blank. -->
+<description_file>1623-78.htm</description_file><!-- Path of top-level description file for this cave, when a separate file is used. Otherwise blank. -->
 <url>1623/78.htm</url><!-- (Required). Relative URL of this cave. i.e the URL this cave appears at on the website, not including 'https://expo.survex.com/. Normally area/cavenum., e.g ('1623/000')-->
 </cave>
 </body>